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1、Rajietal.ComparisonofGrowthofMaleandFemaleKidsofNondescriptGoatsinaSemiAridRegionofNigeria1*11ResearchArticleA.O.Raji,L.G.AsheikhandI.D.Mohammed1DepartmentofAnimalScience,UniversityofMaiduguri,Maiduguri,NigeriaReceivedon:26Jan2014Revisedon:20Apr2014Acceptedo
2、n:30Apr2014OnlinePublishedon:Mar2015*CorrespondenceE‐mail:razrajpearl@yahoo.com©2010CopyrightbyIslamicAzadUniversity,RashtBranch,Rasht,IranOnlineversionisavailableon:www.ijas.irThisstudycomparedtheuseoffivedifferentmodelstodescribethegrowthfrombirthto20weeks
3、ofageofkidsfrombothgendersofnondescriptgoats.Fiftynine(59)nondescriptkidswereweighedweeklyattheuniversityofMaidugurilivestockteachingandresearchfarm,Nigeriaandtheliveweightsweremodeled.BiologicallyrelevantvariableswereestimatedforeachkidfromtheLogistic,Gompe
4、rtz,Richards,Mono-molecularandWeibullmodels.Modelswerecomparedusingthefollowinggoodnessoffitcriteria:coeffi-2cientofdetermination(R),meansquareerror(MSE),standarddeviation(SD)andAkaikeinformation2criteria(AIC).Inbothgenders,allnonlinearmodelsfittedthedatawel
5、l,withhighRrangingfrom0.911to0.943and0.923to0.95formaleandfemale,respectively.Inaddition,themaleshadhigherasymptoticweightthanfemaleswhilethereversewasobservedwithregardstomaturingrate.Malekidshadheavierinflexionweightandhigheragethanfemalesforallthemodels.T
6、hesevalueswerehoweverhigherforLo-2gisticthanGompertzmodel.ThemonomolecularmodelhadhigherRandlowerMSE,SDandAICinbothmaleandfemalekids.Itcanbeconcludedthatthenonlineargrowthmodelsweresuitableforestimatingliveweightasafunctionofageforbothmaleandfemaleofnondescr
7、iptkidsinNigeria.However,thebestmodelwasthemonomolecularbasedonmodelparametersandgoodnessoffitcriteria.KEYWORDSbodyweight,monomolecularmodel,non‐linearmodels,Richardsmodel.ArchiveofSIDINTRODUCTIONknownastherelationbetweenlifetimeweightandageisexplainedmathem
8、aticallybyfunctionsthathaveparametersTheworldpopulationofsheepandgoatsincreasedfromwithbiologicalmeaning.Growthcurvesprovidesetsof1.35billionin1961to1.94billionin2006(FAOSTAT,parametersthatareus
